I assume you do not simply mean
Do you mean cutting an angle into four equal parts?

2 pi radians implies a circle. You could bisect the circle and then bisect each portion once more.

Jun 26th 2005, 05:01 PM

coopsterdude

I am trying to follow the logic of an example in my book. The example is Using Key Points to Sketch a Sine Curve.

Sketch the graph of y = 2 sib x on interval [-pi, 4pi].

it goes on to say: Note that y = 2 sub x = 2(sin x) indicates that the y-values for the key points will have twice the magnitude of the graph of y = sin x. Divide the preiod 2pi into four equal parts to get a set of key points. The points are: (0,0) , (pi/2,2) , (pi,0) , (3pi/-2) , and (2pi,0)

How did the book come up with this set of points. Do I have to use a graphing calulator to find these points? Can I do this without a calculator?

Thanks for any help with this one.

Jun 26th 2005, 11:19 PM

ticbol

Let us forget about the
y = 2 sib x
and
y = 2 sub x

They just add to the confusion.
(What are those, anyway? )

You mean
y = 2 sin x
for the key points?

Well, that sure means the y-values for the key points are twice those corresponding y-values on the y = sin x.